单选题He became aware that he had lost his audience since he had not been able to talk ______ around one topic.

单选题Nancy: Have you heard about Dana? She is going to get married with Graham. Scott: ______

单选题You ______ drive carefully. The roads are wet.

单选题I was too ______ to ask him for help.

单选题We promise_______attends the party a chance to have a photo taken with the movie star. 

单选题The customs officer asked me if I had anything to ______

单选题 Teenagers at risk of depression, anxiety and suicide often wear their troubles like a neon (霓虹灯) sign. Their risky behaviors—drinking too much alcohol, using illegal drugs, smoking cigarettes and skipping school—can alert parents and teachers that serious problems are brewing. But a new study finds that there's another group of adolescents who are in nearly as much danger of experiencing the same psychiatric symptoms: teens who use tons of media, don't get enough sleep and have a sedentary (不爱活动的) lifestyle. Of course, that may sound like a description of every teenager on the planet. But the study warns that it is teenagers who engage in all three of these practices in the extreme who are truly in jeopardy. Because their behaviors are not usually seen as a red flag, these young people have been dubbed the 'invisible risk' group by the study's authors. 'In some ways they're at greater risk of falling through the cracks,' says researcher Vladimir Carli. 'While most parents, teachers and clinicians would react to an adolescent using drugs or getting drunk, they may easily overlook teenagers who are engaging in inconspicuous behaviors.' The study's authors surveyed 12,395 students and analyzed nine risk behaviors, including excessive alcohol use, illegal drug use, heavy smoking, high media use and truancy (逃学). Their aim was to determine the relationship between these risk behaviors and mental health issues in teenagers. About 58% of the students demonstrated none or few of the risk behaviors. Some 13% scored high on all nine of the risk behaviors. And 29%, the 'invisible risk' group, scored high on three in particular.. They spent five hours a day or more on electronic devices. They slept six hours a night or less. And they neglected 'other healthy activities.' The group that scored high on all nine of the risk behaviors was most likely to show symptoms of depression; in all, nearly 15% of this group reported being depressed, compared with just 4% of the low-risk group. But the invisible group wasn't far behind the high-risk set, with more than 13% of them exhibiting depression. The findings caught Carli off guard. 'We were very surprised,' he says. 'The high-risk group and low-risk group are obvious. But this third group was not only unexpected, it was so distinct and so large—nearly one third of our sample—that it became a key finding of the study.' Carli says that one of the most significant things about his study is that it provides new early-warning signs for parents, teachers and mental health-care providers. And early identification, support and treatment for mental health issues, he says, are the best ways to keep them from turning into full-blown disorders.

单选题They are considering ________ as the prices may go up.

单选题It's high time ( ) about the traffic problem.

单选题选出下面读音不同的选项（）。

单选题Whether she will go or not is ______

单选题He criticized everything and everybody, and even ______ his few friends. A. ran over B. ran down C. ran against D. ran into

单选题 Directions: For this part, you are allowed 30 minutes to write an essay on university students' physical health. Your essay should focus on why students are in bad physical health. You are required to write at least 150 words but no more than 200 words.

单选题I wish ______ you the answer to your problems.

单选题Jean could be a very attractive girl but she ______ to her clothes. A. pays no attention B. was paying no attention C. paid no attention D. had paid no attention

单选题A young man sees a sunset and, unable to understand or express the emotion that it ______ in him, concludes that it must be the gateway to a world that lies beyond.

单选题The next decade could see commuters speeding to work at about 300 miles per hour aboard magnetic levitation vehicles, according to a report by Argonne National Laboratories. But before "maglev" vehicles can become commercial successes, the report says, people need to stop thinking of them as high-speed trains. Instead, consider them low-flying aircraft. Argonne contends that maglev vehicles will be best suited to replace commuter aircraft. Plane flights under 600 miles are the least energy-efficient, and maglev "planes" should cut these fuel needs by up to 75 percent. Reportedly, the money saved by a 2,000- mile maglev network linking major cities world more than pay for its construction in 20 years. The quiet purr of levitating crafts would also be a balm for neighborhoods tormented by the roar of conventional takeoffs and landings. The technology behind magnetic levitation is already well understood, the report notes. The west Germans and the Japanese already well understood, the report notes. The West Germans and the Japanese have several full-scale working models. Meanwhile, research in the United States has lapsed.

单选题He (lived) in Beijing (since) 1980 to 1997, but he (is now living) (in) Shanghai.